in fact, over the last five years, no other energy company has invested more in the us than bp. we're working to fuel america for generations to come. today, our commitment to the gulf, and to america, has never been stronger. [ male announcer ] how do you make 70,000 trades a second... ♪ reach one customer at a time? ♪ or help doctors turn billions of bytes of shared information... ♪ into a fifth anniversary of remission? ♪ whatever your business challenge, dell has the technology and services to help you solve it. >>> a north korean soldier says he killed his platoon and squad leaders before defecting to the south. south korean soldiers along the demilitarized zone heard the gun shots before the soldier crossed the heavily armed area between the countries. paula hancocks has details. >> reporter: it's not unknown but certainly rare for a north korean to escape through the dmz, the demilitarized zone that separates north and south korea. it is described as the most heavily fortified border on earth, yet a north korean soldier was able to walk across it on saturday. the